G'day David,
Given the number of people who seem to use Alexa 'rankings' as the basis of an Afd decision on website articles, I thought you guys might be interested in this article:
http://www.johnchow.com/index.php/why-alexa-is-worthless/
It has been clear for a long time that Alexa 'rankings' are utter crap, as they are based not on website visitors and links (as Google or Yahoo rankings are) but on the activities of those infected with Alexa's spyware-esque toolbar.
Pray allow me to be the first to drop the facade of maturity and cry out: "Well, DUH!"
Alexa is now, always has been, and almost certainly will be in the future, utterly useless ... their rankings *and* their stupid little toolbar. Anyone silly enough to take the rankings at face value needs to be whacked with a Cluebat.